Going to Paris, Looking for Advice

[Dexter Morgan]

So I get a call from my wife today, and she says that she has a business trip scheduled in April, and that the conference will be in Paris. Apparently her employer has also offered to pay for mine and my daughter's flights out there, as well as the extended stay beyond the business portion of the trip.

I love to travel and Paris is definitely on my list, so I'm realllllly excited. It's also going to be our first trip to Europe, so I'm not sure what to expect. I'm looking for any general advice from those who live, or have been there, for some of the following things...

What is the general opinion of Americans? Moreover, are there things that Americans do that the French would find insulting? We like to think of ourselves as polite people, but we know that all cultures are different.
Is the city safe? Any suggested precautions?
Small child friendly? We will be bringing a one year old.
What are some of the must-see attractions? We know the major places such as Eiffel Tower, Arc de Triomphe, Notre Dame, Louvre... but I'm sure there are many other nice places to visit.
Any other suggestions?

Thanks in advance for any advice.